Great place to stay! We had an amazing time at the beautiful place of Ago. Check in was easy, the communication beforehand was very good and all went well. The apartment looks exactly like in the pictures, plenty of space and a cool TV. The pool was also very good. Ago provides a handbook with all the do's and don'ts, which was very helpful.
The location is of course not central, but for us it was perfect. we had many appointments in Sathorn, so it was perfect. To Sukhumvit it takes you about 20 min by cab or 40 min by Skytrain.
Communication during the stay was also smooth and we had no issues at all. Can only recommend the place, if you are looking for a quiet time in Bangkok!